I hope Shammy would not mind if this thread appear. If any issues with it - feel free to delete, I would not publish any non-public data about these stuff on purpose, thats for sure.

So I've received my sample after month of customs clearing, and now doing first steps with it. So most things described here by me are lame, stupid and beginner trash. Hope things will clarify in future and i will get new knowledge later

I think k|ngp|n should now know how real Tek9 6.66 look like :-D
Better is only FAT pot with untouchabled GTX480 maybe

I've hooked extra VRM with usual technique, removing stock chokes and putting volts from external VRM into power plane inputs. Now I used 7 solid copper wires for VGPU power and 3 same wires for Vmemory power.
I've never used such type solid copper wires, only thick "audiophile-type" multiwired cables with thick insulation.

Also 10 GND wires was used as interconnect. I've hooked 2-channel voltage meter to out pads on EVGA card.
Videocard have added tantalum capacitors on memory and core VRM, just in points where wires joints.
Ripple and noise was measured by oscilloscope probe on these capacitors pads.

The untouchables was cooled by high-cfm 80mm fan, and VGA NVIO area was cooled by 120mm fan. I've used LN2 pot with temps -20 to -70°C, because it's the only cooler i have now, that fits this card. Further testing will be done with chiller unit.

All PCI-E power connectors was populated with cables from single Enermax Revolution 1250W PSU. TWO was hooked to VGA itself and three for EVGA VRM.

Total look w/o fans:

Before going windows with this rig, i've applied 1450mV voltage for main 10-channel power VRM.
It was done digitally from my ES device, I think same way as EVbot does.
So, i've booted and run 3dmark03 nature, on stock clocks for VGA and 1

Idle volts:

Load volts:

Drop of voltage is huge, almost 100mV. I think I should use much more wires for such type of VGAs. And maybe better use multiwire cables, to reduce impedance and skin-effect?

During test and transients I've noticed high-pitched noise from VRM (usual stuff) and heavy horisontal bars flickering fast on screen. Tried to capture that with next photo. Horisontal lines more visible with heavy loads, and less with lighter, but present always in any 3D test and appear even during 3dmark03 loading in windows.

With lower volts (stock for GTX285 are near 1.1V), e.g. 1.25V card could not even do GT1 of 3d03.
It halts like this:

The cable is polyestermide/polyurethane insulated - so needs scraping slightly. Maybe bad joints. Multi strand wire won't help really (i don't think skin-effect is causing any kind of problem). I have my UT half connected up to a board here, when i get time I'll complete the mod and see what happens.

Sham, what about my #5 post? Hook feedback line to that points (where VR suggested)?

I DMMed them, one seems Vcore, second GND, but want to be sure with these volterras.

UPDATE:

Testing done.

Ripple on memory voltage (measurement same point, VRM out capacitor on VGA PCB) reduced from ~300+mV to near 90-120mV. It's now acceptable (as stock VRM on such cards).
Ripple on core voltage improved from ~600mV shi(f)t to mere 200-220mV on stock clocks and 1.4V (dropping to 1.33-1.36) and 240-260mV with 850MHz clocks and near zero GPU monitoring temp.

Horisontal banding flicker still exist under load, by looks like less?